You can never correct your work well until you have forgotten it.

The monster, fanaticism, still exists, and whoever seeks after truth will run the risk of being persecuted.

What will the preachers say? .. to teach men not to persecute men: for, while a few sanctimonious humbugs are burning a few fanatics, the earth opens and swallows up all alike.

There is only one morality, as there is only one geometry.

Virtue debases itself in justifying itself.

The Deluge: A punishment inflicted on the human race by an all-knowing God, who, through not having foreseen the wickedness of men, repented of having made them, and drowned them once for all to make them better - an act which, as we all know, was accompanied by the greatest success.

Virtuous men alone possess friends.